Stock-feed attachment



Feb. 10. 1925,. 1,526,050

v A. R. cARMlcl-IAEL STOCK FEED ATTACHMENT Filed Aug. 22, 1921 INVENTOR. y wefn/ E 4e/wang BY Y ATTORNEYS,

Patented Feb. 10, 1925.

UNITED STATES PATENT OFFICE.

ANDREW R. CARMICI-IAEI, (Jlv INDIANAPOLIS, INDIANA, ASSIG-NOR OF ONE-THIRD TO HARVEY PEARSO'N AND ONE-THIRD TO JOHN J. SCOTT, BOTH 0F INDIANAPOLIS,

INDIANA.

STOCK-FEED ATTACHMENT.

Application filed August 22, 1921. Serial No. 494,247.

To all who-m t 'may concern:

Be it known that I, ANDREW R. CAR- Miorrann, a citizen of the United States, and a resident of Indianapolis, county of Marion, and State of Indiana, have invented a. certain new and useful Stock-Feed Attachment; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, in which like numerals refer to like parts.

This invention relatesto means for feeding the stock to and in a machine such as a lathe. The object of the invention is to provide means which may be associated with certain machines, such as lathes, for mechanically 4feeding the stock through said machine in an improved manner v The chief feature of the invention consists in forming the aforesaid-means to accomplish said object as an attachment so that the same can be readilyA associated with machines of the general type indicated.

Another feature of the invention includes the provision of means for permitting the progressive feeding movement of the stock, but preventing the return movement thereof, which means is associated with the feeding means heretofore enumerated.

The particular feature of the invention consists in the particulary arrangement and construct-ion of the stock feeding mechanism.

The full nature of this invention will be understood from the accompanying drawings and the following description and claims. Y

In the drawings Fig. l is a. side elevational view of a lathe and the invention showing the same associated therewith as an attachment. Fig. 2 is an enlarged side elevational view of the invention and a portion of the machine with which the same is associated, parts being shown in section to illustrate the same in detail and other parts being shown in full and dot-ted line positions. Fig. 3 is an enlarged elevational view of the stock feeding mechanism taken on the line 3 3 of Fig. 2 and in the direction of the arrows. Fig. 4 is a central sectional view taken on the line 4 4; of Fig. 3 and in the direction of the arrows. Fig. 5 is a sectional View of a modified form of stock feeding tooth.

In the drawings 10 indicates a lathe provided with a. chuck construction or stock holding means 11 which is adapted to be rotated by the cone pulley 12. Said chuck construction may be opened and closed by means of the lever 13. All of the foregoing may be of the usual or any preferred construction, as desired. Also associated with the lathe are the standards 14 and 15 which support a. pipe 16, which in turn supports the stock 17 in the usual manner. rIhe lever 13 is@ pivotally supported at 117 upon the head of the lathe and the shaft 117 supports a lever` 18 which is connected by means of a link bar 19 to another lever 20 pivotally supported on said lathe head. The lever 2O preferably is yoke-shaped and engages a shifting member or collar 21 which carries one or .more locking finger levers 22. Associated with the locking finger 22 is the sleeve 23 and also associated therewith is the spindle 211 which is provided with an exteriorly threaded nose 25 to receive an interiorly threaded spindle cap 26. The ring 27 is associated with the collar 28 to clamp and lock the stock 17 inthe desired position. The lathe 10 .is provide-d with a. turret 29 or a suitable tail stock as desired, and associated therewith is a Istop member 30. All of the foregoing is of the usual or preferred construction and forms no part of the present invention, save that t-he operative featuresV thereof are associated with the features of the attachment. rIhe lever 13 is extended at 31 and suitable means may be associated with said lever for rocking the same and the shaft 117 for automatically opening and closing the chuck construction to release and clamp the stock 17 as desired.

Theme-ans for automatically feeding the stock to the chuck includes a supporting bar 32, one end of which is suitably supported upon the lat-he 10 and the other end of which is suitably supported in the standard 15. The standard 15 also suitably supports the bracket 33 which provides a pivot 34 for a lever 35, the depending arm of which is provided with a plurality of holes 36 adapted to receive the pivot pin 37 carried by one end of a link bar 38, the other end of which is connected to the link 19 or the depending arm of the lever 20, see Fig. 2. The stock feeding means is indicated in Figs. 1 and 2 by a housing' or shell 39 with which is associated a` yoke or shifting member 40. The

yoke Li() is provided with a sleeve portion el which is slidably supported upon. the rod or bar 32. The stock feeding mechanism contained in the housing 39 may be of the usual or any preferred construction, and the preferred construction is herein illustrated in Figs. 3 and 4 and will be described hereinafter. it is sufficient here to state that when the rlutch means hereinbefore described releases the stock 17, the jaws of the feeding mechanism 39 will not release said stock and in the n'iovement of the housing 39 towards the lathe the stoel; will simultaneously be moved forwardly until the same engages the stop 30 or any other suitable means, Whereupon the chuck means will be closed by actuatingl the lever 13. 'lhereafter the feeding mechanism, including the housing 39, may be returned to its original position to en;Y the stock in a new position for subsequent feeding.

Herein the means for moving the stock feedii'ig housing 39 and associated mechanisu'itovfards and aivay from the cl1ucl,comprises a sleeve with a depending' projection 43. i'inother sleeve 44 is similarly provided with a depending projection and said projections are adjustably connected together by means of the rod 46 and the locking and adjusting nuts 47. Concentric With the bar or rod 32 is a coil spring 48 which is interposed betiveen the sleeve 42 and the sleeve 41. The lever 35 is provided with an elongated slot 50 adapted to receive a pin 49 carried by the sleeve 42. rlllius, in the movement of the lever 13 to the full line position shown in Fig. 2 from the dotted line position indicated by the dotted line :r the lever 35 simultaneously Will be moved from its dotted line position 'i/-Jy to its full line position in said ligure. This rocking movement of the lever 35 compresses the spring 48 and, since the stock is not moved forwardly until the lever 13 has released the stock by opening the chuck, said spring by bearing on the sleeve 41, when said chuck does open, Will project the stock 17 towards the chuck, carrying with it the housing 39 and associated mechanism into the dotted line position .e-e or until the sleeve 41 engages the sleeve 44. The stock, it will be remembered, is adapted to abut a stop 30 and thus be positioned, if the abutment of sleeves 41 and 44 is not desired.

rl`he rapidity of the forward approaching movement is so great, due to the spring tension 'in the spring 48, that suitable brake means is preferably provided for permitting the stock to be moved in the direction of the chuck.` but which Will prevent the return or Vrebound movement thereof until suoli time as the chuck rigidly engages the stock to hold the same and also permit the stock feeding mechanism to re-engage the stock. Said brake means comprises a supporting member 51 which is rigidly but adjustaliily secured to the bar 32 by the bolt 52. A suitable collar construction 53 provided with the groove 54 and associated With said vgroove is a supporting yoke member 55 .indicated generally by the numeral 39 in Fig. 2, includes the housing 39 carrying the tubular portion 60, said tubular Vportion being provided with a threaded end 61 which is adapted to receive the locking nuts 62, by which a sleeve 63 is secured to said housing but which permits the rotation of said housing' and stock engaging construction With the rotation of the stock, When the same is desired. The housing 39 pivotally supports, upon a suitable shaft 64, a triangular plate 65 which is provided With a serrated face 66 and an arm 67 having a threaded opening 68 therethrough. A toothed plate 69 having a complementarily formed serrated face 70 for engagement with the serrated face 66 is adjustably positioned thereon by means of the adjusting bolt 71 which is positioned adjacent an opening 72 in the shell 39. The toothed plate 69 'is provided with an elongated slot- 73 and the bolt 74 extends through the slot 73 and is adapted to clamp the toothed plate 69 to the triangular base plate 65 in the adjusted position. The toothed plate 69 is provided with an end 75 for engagement With the stock 17. It will be apparent that the triangular base plate. is pivot-ally mounted upon the shaft or pin 64 and, as shown clearly in Figs. 3 and 4, a concentric coil spring 76 has one end 77 engageable upon the triangular base to force the roughened face of the tooth 69 into engagement With the stock 17 and prevent the return movement of said stock and thereby cause said stock to be locked by the feeding mechanism when the base plate 65 engages the back of the housing 39 or the tubular portion 60 thereof. The other end 78 of the spring 76 may be secured to the housing or may also be secured to the shaft 64, and when secured to the shaft 64 the tension of said spring may be adjusted by rotating said shaft in its bearings and securing the shaft thereto in the adjusted position. Such a construction includes a threaded opening in the housing for receiving a threaded end of a pin or pivot 64. The shell 39 is also provided With a threaded opening 79 which is adapted to receive a threaded guide member 80. Herein a pair of oppositely positioned guide members 80 is illustrated and also a pair of toothed plates 69, which plates and guide members are positioned in spaced relation with each other and in alternate relation as well. It

`will be noted, see Fig. 4, that the engagement of the stock by the teeth 69 and guides 80 occurs in the transverse plane including the pivots 64.

From the foregoing it will be noted that when the lever 13 is actuated to open the chuck and release the stock, the spring 48 is compressed and when the chuck is opened and the stock released, the stock feeding construction 39 projects the stock forwardly until the same abuts the stop 30 and in this vforward movement said stock passes through the brake construction described. The return movement of the stock, due to this impact upon the stop 30, is prevented by the resistance of the brake shoes 58 thereon. lNhen the stock is positioned, movement of the lever 13 in the opposite direction locks the stock in the chuck and simultaneously returns the lever 35 to the dotted line position y-y and the stock feeding mechanism from the dotted line position .Q -.e to the full line position shown in Fig. 2. Subsequent operation of the handle thereupon compresses the spring 48 and the operation of the device is repeated as described.

in Fig. 5 there is illustrated a modifie-d and the preferred form of toothed plate 95 which is somewhat similar to the toothed plate 65 with the. following changes however. The plate 95 is provided with an opening 96 which extends parallel to one of the angular faces and another opening 97 extends transversely thereof and communicates therewith. The opening 96 is reduced at 98 to provide a seat 99 for a bearing portion 100 of an adjusting` bolt carrying the head 101 and the threaded stem 102. The recess 97 in the main body portion thereof is adapted to receive a spring 103 and a rocking pin 104. A tooth or gripping pin 105 is provided with a groove 106 and a threaded opening 107. The threaded opening is adapted to receive the threaded stem 102 of the adjusting bolt and the elongated groove 106 is adapted to receive the pin 104, thereby preventing rotation of the gripping pin 105. It will, of course, be understood that the entire toothed construction herein described Iis pivotally mounted and yieldingly mounted to permit the pin 105 to engage the stock 17 and permit the same to be fed forwardly into the machine but prevent the return of said stock.

The invention claimed is:

1. The combination with a lathe having a stock chucking device and a lever for locking and releasing the same, of a stock feeding mechanism for said lathe, including a longitudinal support, a stock feeding device slidably supported thereby, a pair of members similarly supported upon opposite sides of said device and connected together, a spring interposed between one of said members and said stock feeding device for sliding the latter when the chucking device is released and a connection between said lever and said spring associated slidable member for sliding the latter to place said spring in operative condition.

2. A device of the character described in claim 1 characterized by an adjustable connection between the slidably supported members.

3. A device of the character described in claim 1 characterized by an adjustable connection between the lever and spring associated slidable member.

4. A device of the character described in claim 1 characterized by an adjustable connection between the lever and spring associated slidable member, and an adjustable connection between the slidably supported members.

In witness whereof, I have hereunto aflixed my signature.

ANDREWY R. CARMICHAEL. 

